a one-on-one interview with the maryland senator, live from the dnc in charlotte. and how come police tasered this lady, which he was already in handcuffs? if that does not look right to us, we'll tell you what happened at 7:00. >> okay, derek. >>> still to come in this half hour, good news in the wake of hurricane isaac after all that rain. >>> but first, metro's red line will get to work this weekend as you will want to know what will be closed for you before you need to make plans. >>> the judiciary square and union stations are going to be completely closed, but that work should be finished by the time the system opens on monday morning. >>> the fbi is trying to track down the person behind the airline hoax. the culprit called police this morning and they said a particular passenger would try to carry a dangerous substance on to the u.s. airways flight from philadelphia to dallas. that flight was already in the air, but the plane quickly returned to philadelphia. police, they detained the passenger who was named by the caller and searched the plane, but they di